COLLARLESS
Meaning of COLLARLESS in English
col ‧ lar ‧ less /ˈkɒlələs $ ˈkɑːlər-/ BrE AmE adjective
a collarless jacket, shirt etc is one that does not have a collar
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012